Correlation coefficients (R) of monthly and annual G/B anomalies with environmental and climatic records.

Bold values significant at p<0.05. Abbreviations: SOI, Southern Oscillation Index; PDO, Pacific Decadal Oscillation; CPIPO, combined paleo IPO-PDO; IPO, Interdecadal Pacific Oscillation. PRECDS, period of record for environmental and climatic data sets. * = incomplete monthly record for the period indicated. ** = complete monthly record for the period indicated. *** = only complete annual values for the period indicated. Further information on data sets is provided in Methods (section Environmental and climatic data).